ip/iprule.c

   1 /*
   2  * iprule.c             "ip rule".
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <netinet/ip.h>
  21 #include <arpa/inet.h>
  22 #include <string.h>
  23 #include <linux/if.h>
  24 #include <linux/fib_rules.h>
  25 #include <errno.h>
  26
  27 #include "rt_names.h"
  28 #include "utils.h"
  29 #include "ip_common.h"
  30
  31 enum list_action {
  32         IPRULE_LIST,
  33         IPRULE_FLUSH,
  34         IPRULE_SAVE,
  35 };
  36
  37 extern struct rtnl_handle rth;
  38
  39 static void usage(void) __attribute__((noreturn));
  40
  41 static void usage(void)
  42 {
  43         fprintf(stderr, "Usage: ip rule { add | del } SELECTOR ACTION\n");
  44         fprintf(stderr, "       ip rule { flush | save | restore }\n");
  45         fprintf(stderr, "       ip rule [ list [ SELECTOR ]]\n");
  46         fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
  47         fprintf(stderr, "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n");
  48         fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
  49         fprintf(stderr, "          [ nat ADDRESS ]\n");
  50         fprintf(stderr, "          [ realms [SRCREALM/]DSTREALM ]\n");
  51         fprintf(stderr, "          [ goto NUMBER ]\n");
  52         fprintf(stderr, "          SUPPRESSOR\n");
  53         fprintf(stderr, "SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n");
  54         fprintf(stderr, "              [ suppress_ifgroup DEVGROUP ]\n");
  55         fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
  56         exit(-1);
  57 }
  58
  59 static struct
  60 {
  61         int not;
  62         int l3mdev;
  63         int iifmask, oifmask;
  64         unsigned int tb;
  65         unsigned int tos, tosmask;
  66         unsigned int pref, prefmask;
  67         unsigned int fwmark, fwmask;
  68         char iif[IFNAMSIZ];
  69         char oif[IFNAMSIZ];
  70         inet_prefix src;
  71         inet_prefix dst;
  72 } filter;
  73
  74 static bool filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
  75 {
  76         struct rtmsg *r = NLMSG_DATA(n);
  77         inet_prefix src = { .family = r->rtm_family };
  78         inet_prefix dst = { .family = r->rtm_family };
  79         __u32 table;
  80
  81         if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
  82                 return false;
  83
  84         if (filter.prefmask &&
  85             filter.pref ^ (tb[FRA_PRIORITY] ? rta_getattr_u32(tb[FRA_PRIORITY]) : 0))
  86                 return false;
  87         if (filter.not && !(r->rtm_flags & FIB_RULE_INVERT))
  88                 return false;
  89
  90         if (filter.src.family) {
  91                 if (tb[FRA_SRC]) {
  92                         memcpy(&src.data, RTA_DATA(tb[FRA_SRC]),
  93                                (r->rtm_src_len + 7) / 8);
  94                 }
  95                 if (filter.src.family != r->rtm_family ||
  96                     filter.src.bitlen > r->rtm_src_len ||
  97                     inet_addr_match(&src, &filter.src, filter.src.bitlen))
  98                         return false;
  99         }
 100
 101         if (filter.dst.family) {
 102                 if (tb[FRA_DST]) {
 103                         memcpy(&dst.data, RTA_DATA(tb[FRA_DST]),
 104                                (r->rtm_dst_len + 7) / 8);
 105                 }
 106                 if (filter.dst.family != r->rtm_family ||
 107                     filter.dst.bitlen > r->rtm_dst_len ||
 108                     inet_addr_match(&dst, &filter.dst, filter.dst.bitlen))
 109                         return false;
 110         }
 111
 112         if (filter.tosmask && filter.tos ^ r->rtm_tos)
 113                 return false;
 114
 115         if (filter.fwmark) {
 116                 __u32 mark = 0;
 117                 if (tb[FRA_FWMARK])
 118                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 119                 if (filter.fwmark ^ mark)
 120                         return false;
 121         }
 122         if (filter.fwmask) {
 123                 __u32 mask = 0;
 124                 if (tb[FRA_FWMASK])
 125                         mask = rta_getattr_u32(tb[FRA_FWMASK]);
 126                 if (filter.fwmask ^ mask)
 127                         return false;
 128         }
 129
 130         if (filter.iifmask) {
 131                 if (tb[FRA_IFNAME]) {
 132                         if (strcmp(filter.iif, rta_getattr_str(tb[FRA_IFNAME])) != 0)
 133                                 return false;
 134                 } else {
 135                         return false;
 136                 }
 137         }
 138
 139         if (filter.oifmask) {
 140                 if (tb[FRA_OIFNAME]) {
 141                         if (strcmp(filter.oif, rta_getattr_str(tb[FRA_OIFNAME])) != 0)
 142                                 return false;
 143                 } else {
 144                         return false;
 145                 }
 146         }
 147
 148         if (filter.l3mdev && !(tb[FRA_L3MDEV] && rta_getattr_u8(tb[FRA_L3MDEV])))
 149                 return false;
 150
 151         table = rtm_get_table(r, tb);
 152         if (filter.tb > 0 && filter.tb ^ table)
 153                 return false;
 154
 155         return true;
 156 }
 157
 158 int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 159 {
 160         FILE *fp = (FILE *)arg;
 161         struct rtmsg *r = NLMSG_DATA(n);
 162         int len = n->nlmsg_len;
 163         int host_len = -1;
 164         __u32 table;
 165         struct rtattr *tb[FRA_MAX+1];
 166
 167         SPRINT_BUF(b1);
 168
 169         if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
 170                 return 0;
 171
 172         len -= NLMSG_LENGTH(sizeof(*r));
 173         if (len < 0)
 174                 return -1;
 175
 176         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 177
 178         host_len = af_bit_len(r->rtm_family);
 179
 180         if(!filter_nlmsg(n, tb, host_len))
 181                 return 0;
 182
 183         if (n->nlmsg_type == RTM_DELRULE)
 184                 fprintf(fp, "Deleted ");
 185
 186         if (tb[FRA_PRIORITY])
 187                 fprintf(fp, "%u:\t",
 188                         rta_getattr_u32(tb[FRA_PRIORITY]));
 189         else
 190                 fprintf(fp, "0:\t");
 191
 192         if (r->rtm_flags & FIB_RULE_INVERT)
 193                 fprintf(fp, "not ");
 194
 195         if (tb[FRA_SRC]) {
 196                 if (r->rtm_src_len != host_len) {
 197                         fprintf(fp, "from %s/%u ",
 198                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_SRC]),
 199                                 r->rtm_src_len);
 200                 } else {
 201                         fprintf(fp, "from %s ",
 202                                 format_host_rta(r->rtm_family, tb[FRA_SRC]));
 203                 }
 204         } else if (r->rtm_src_len) {
 205                 fprintf(fp, "from 0/%d ", r->rtm_src_len);
 206         } else {
 207                 fprintf(fp, "from all ");
 208         }
 209
 210         if (tb[FRA_DST]) {
 211                 if (r->rtm_dst_len != host_len) {
 212                         fprintf(fp, "to %s/%u ",
 213                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_DST]),
 214                                 r->rtm_dst_len);
 215                 } else {
 216                         fprintf(fp, "to %s ",
 217                                 format_host_rta(r->rtm_family, tb[FRA_DST]));
 218                 }
 219         } else if (r->rtm_dst_len) {
 220                 fprintf(fp, "to 0/%d ", r->rtm_dst_len);
 221         }
 222
 223         if (r->rtm_tos) {
 224                 SPRINT_BUF(b1);
 225                 fprintf(fp, "tos %s ",
 226                         rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 227         }
 228
 229         if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
 230                 __u32 mark = 0, mask = 0;
 231
 232                 if (tb[FRA_FWMARK])
 233                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 234
 235                 if (tb[FRA_FWMASK] &&
 236                     (mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
 237                         fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
 238                 else
 239                         fprintf(fp, "fwmark 0x%x ", mark);
 240         }
 241
 242         if (tb[FRA_IFNAME]) {
 243                 fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
 244                 if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
 245                         fprintf(fp, "[detached] ");
 246         }
 247
 248         if (tb[FRA_OIFNAME]) {
 249                 fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
 250                 if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
 251                         fprintf(fp, "[detached] ");
 252         }
 253
 254         if (tb[FRA_L3MDEV]) {
 255                 if (rta_getattr_u8(tb[FRA_L3MDEV]))
 256                         fprintf(fp, "lookup [l3mdev-table] ");
 257         }
 258
 259         table = rtm_get_table(r, tb);
 260         if (table) {
 261                 fprintf(fp, "lookup %s ",
 262                         rtnl_rttable_n2a(table, b1, sizeof(b1)));
 263
 264                 if (tb[FRA_SUPPRESS_PREFIXLEN]) {
 265                         int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
 266
 267                         if (pl != -1)
 268                                 fprintf(fp, "suppress_prefixlength %d ", pl);
 269                 }
 270                 if (tb[FRA_SUPPRESS_IFGROUP]) {
 271                         int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
 272
 273                         if (group != -1) {
 274                                 SPRINT_BUF(b1);
 275                                 fprintf(fp, "suppress_ifgroup %s ",
 276                                         rtnl_group_n2a(group, b1, sizeof(b1)));
 277                         }
 278                 }
 279         }
 280
 281         if (tb[FRA_FLOW]) {
 282                 __u32 to = rta_getattr_u32(tb[FRA_FLOW]);
 283                 __u32 from = to>>16;
 284
 285                 to &= 0xFFFF;
 286                 if (from) {
 287                         fprintf(fp, "realms %s/",
 288                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 289                 }
 290                 fprintf(fp, "%s ",
 291                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 292         }
 293
 294         if (r->rtm_type == RTN_NAT) {
 295                 if (tb[RTA_GATEWAY]) {
 296                         fprintf(fp, "map-to %s ",
 297                                 format_host_rta(r->rtm_family,
 298                                                 tb[RTA_GATEWAY]));
 299                 } else
 300                         fprintf(fp, "masquerade");
 301         } else if (r->rtm_type == FR_ACT_GOTO) {
 302                 fprintf(fp, "goto ");
 303                 if (tb[FRA_GOTO])
 304                         fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
 305                 else
 306                         fprintf(fp, "none");
 307                 if (r->rtm_flags & FIB_RULE_UNRESOLVED)
 308                         fprintf(fp, " [unresolved]");
 309         } else if (r->rtm_type == FR_ACT_NOP)
 310                 fprintf(fp, "nop");
 311         else if (r->rtm_type != RTN_UNICAST)
 312                 fprintf(fp, "%s",
 313                         rtnl_rtntype_n2a(r->rtm_type,
 314                                          b1, sizeof(b1)));
 315
 316         fprintf(fp, "\n");
 317         fflush(fp);
 318         return 0;
 319 }
 320
 321 static __u32 rule_dump_magic = 0x71706986;
 322
 323 static int save_rule_prep(void)
 324 {
 325         int ret;
 326
 327         if (isatty(STDOUT_FILENO)) {
 328                 fprintf(stderr, "Not sending a binary stream to stdout\n");
 329                 return -1;
 330         }
 331
 332         ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
 333         if (ret != sizeof(rule_dump_magic)) {
 334                 fprintf(stderr, "Can't write magic to dump file\n");
 335                 return -1;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int save_rule(const struct sockaddr_nl *who,
 342                      struct nlmsghdr *n, void *arg)
 343 {
 344         int ret;
 345
 346         ret = write(STDOUT_FILENO, n, n->nlmsg_len);
 347         if ((ret > 0) && (ret != n->nlmsg_len)) {
 348                 fprintf(stderr, "Short write while saving nlmsg\n");
 349                 ret = -EIO;
 350         }
 351
 352         return ret == n->nlmsg_len ? 0 : ret;
 353 }
 354
 355 static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n,
 356                       void *arg)
 357 {
 358         struct rtnl_handle rth2;
 359         struct rtmsg *r = NLMSG_DATA(n);
 360         int len = n->nlmsg_len;
 361         struct rtattr *tb[FRA_MAX+1];
 362
 363         len -= NLMSG_LENGTH(sizeof(*r));
 364         if (len < 0)
 365                 return -1;
 366
 367         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 368
 369         if (tb[FRA_PRIORITY]) {
 370                 n->nlmsg_type = RTM_DELRULE;
 371                 n->nlmsg_flags = NLM_F_REQUEST;
 372
 373                 if (rtnl_open(&rth2, 0) < 0)
 374                         return -1;
 375
 376                 if (rtnl_talk(&rth2, n, NULL, 0) < 0)
 377                         return -2;
 378
 379                 rtnl_close(&rth2);
 380         }
 381
 382         return 0;
 383 }
 384
 385 static int iprule_list_flush_or_save(int argc, char **argv, int action)
 386 {
 387         rtnl_filter_t filter_fn;
 388         int af = preferred_family;
 389
 390         if (af == AF_UNSPEC)
 391                 af = AF_INET;
 392
 393         if (action != IPRULE_LIST && argc > 0) {
 394                 fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
 395                                 action == IPRULE_SAVE ? "save" : "flush");
 396                 return -1;
 397         }
 398
 399         switch (action) {
 400         case IPRULE_SAVE:
 401                 if (save_rule_prep())
 402                         return -1;
 403                 filter_fn = save_rule;
 404                 break;
 405         case IPRULE_FLUSH:
 406                 filter_fn = flush_rule;
 407                 break;
 408         default:
 409                 filter_fn = print_rule;
 410         }
 411
 412         memset(&filter, 0, sizeof(filter));
 413
 414         while (argc > 0) {
 415                 if (matches(*argv, "preference") == 0 ||
 416                     matches(*argv, "order") == 0 ||
 417                     matches(*argv, "priority") == 0) {
 418                         __u32 pref;
 419                         NEXT_ARG();
 420                         if (get_u32(&pref, *argv, 0))
 421                                 invarg("preference value is invalid\n", *argv);
 422                         filter.pref = pref;
 423                         filter.prefmask = 1;
 424                 } else if (strcmp(*argv, "not") == 0) {
 425                         filter.not = 1;
 426                 } else if (strcmp(*argv, "tos") == 0) {
 427                         __u32 tos;
 428                         NEXT_ARG();
 429                         if (rtnl_dsfield_a2n(&tos, *argv))
 430                                 invarg("TOS value is invalid\n", *argv);
 431                         filter.tos = tos;
 432                         filter.tosmask = 1;
 433                 } else if (strcmp(*argv, "fwmark") == 0) {
 434                         char *slash;
 435                         __u32 fwmark, fwmask;
 436                         NEXT_ARG();
 437                         slash = strchr(*argv, '/');
 438                         if (slash != NULL)
 439                                 *slash = '\0';
 440                         if (get_u32(&fwmark, *argv, 0))
 441                                 invarg("fwmark value is invalid\n", *argv);
 442                         filter.fwmark = fwmark;
 443                         if (slash) {
 444                                 if (get_u32(&fwmask, slash+1, 0))
 445                                         invarg("fwmask value is invalid\n",
 446                                                slash+1);
 447                                 filter.fwmask = fwmask;
 448                         }
 449                 } else if (strcmp(*argv, "dev") == 0 ||
 450                            strcmp(*argv, "iif") == 0) {
 451                         NEXT_ARG();
 452                         strncpy(filter.iif, *argv, IFNAMSIZ);
 453                         filter.iifmask = 1;
 454                 } else if (strcmp(*argv, "oif") == 0) {
 455                         NEXT_ARG();
 456                         strncpy(filter.oif, *argv, IFNAMSIZ);
 457                         filter.oifmask = 1;
 458                 } else if (strcmp(*argv, "l3mdev") == 0) {
 459                         filter.l3mdev = 1;
 460                 } else if (matches(*argv, "lookup") == 0 ||
 461                            matches(*argv, "table") == 0 ) {
 462                         __u32 tid;
 463                         NEXT_ARG();
 464                         if (rtnl_rttable_a2n(&tid, *argv))
 465                                 invarg("table id value is invalid\n", *argv);
 466                         filter.tb = tid;
 467                 } else if (matches(*argv, "from") == 0 ||
 468                            matches(*argv, "src") == 0) {
 469                         NEXT_ARG();
 470                         get_prefix(&filter.src, *argv, af);
 471                 } else {
 472                         if (matches(*argv, "dst") == 0 ||
 473                             matches(*argv, "to") == 0) {
 474                                 NEXT_ARG();
 475                         }
 476                         get_prefix(&filter.dst, *argv, af);
 477                 }
 478                 argc--; argv++;
 479         }
 480
 481         if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
 482                 perror("Cannot send dump request");
 483                 return 1;
 484         }
 485
 486         if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
 487                 fprintf(stderr, "Dump terminated\n");
 488                 return 1;
 489         }
 490
 491         return 0;
 492 }
 493
 494 static int rule_dump_check_magic(void)
 495 {
 496         int ret;
 497         __u32 magic = 0;
 498
 499         if (isatty(STDIN_FILENO)) {
 500                 fprintf(stderr, "Can't restore rule dump from a terminal\n");
 501                 return -1;
 502         }
 503
 504         ret = fread(&magic, sizeof(magic), 1, stdin);
 505         if (magic != rule_dump_magic) {
 506                 fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n",
 507                         ret, magic);
 508                 return -1;
 509         }
 510
 511         return 0;
 512 }
 513
 514 static int restore_handler(const struct sockaddr_nl *nl,
 515                            struct rtnl_ctrl_data *ctrl,
 516                            struct nlmsghdr *n, void *arg)
 517 {
 518         int ret;
 519
 520         n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
 521
 522         ll_init_map(&rth);
 523
 524         ret = rtnl_talk(&rth, n, n, sizeof(*n));
 525         if ((ret < 0) && (errno == EEXIST))
 526                 ret = 0;
 527
 528         return ret;
 529 }
 530
 531
 532 static int iprule_restore(void)
 533 {
 534         if (rule_dump_check_magic())
 535                 exit(-1);
 536
 537         exit(rtnl_from_file(stdin, &restore_handler, NULL));
 538 }
 539
 540 static int iprule_modify(int cmd, int argc, char **argv)
 541 {
 542         int l3mdev_rule = 0;
 543         int table_ok = 0;
 544         __u32 tid = 0;
 545         struct {
 546                 struct nlmsghdr n;
 547                 struct rtmsg            r;
 548                 char                    buf[1024];
 549         } req = {
 550                 .n.nlmsg_type = cmd,
 551                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
 552                 .n.nlmsg_flags = NLM_F_REQUEST,
 553                 .r.rtm_family = preferred_family,
 554                 .r.rtm_protocol = RTPROT_BOOT,
 555                 .r.rtm_scope = RT_SCOPE_UNIVERSE,
 556                 .r.rtm_type = RTN_UNSPEC,
 557         };
 558
 559         if (cmd == RTM_NEWRULE) {
 560                 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
 561                 req.r.rtm_type = RTN_UNICAST;
 562         }
 563
 564         if (cmd == RTM_DELRULE && argc == 0) {
 565                 fprintf(stderr, "\"ip rule del\" requires arguments.\n");
 566                 return -1;
 567         }
 568
 569         while (argc > 0) {
 570                 if (strcmp(*argv, "not") == 0) {
 571                         req.r.rtm_flags |= FIB_RULE_INVERT;
 572                 } else if (strcmp(*argv, "from") == 0) {
 573                         inet_prefix dst;
 574
 575                         NEXT_ARG();
 576                         get_prefix(&dst, *argv, req.r.rtm_family);
 577                         req.r.rtm_src_len = dst.bitlen;
 578                         addattr_l(&req.n, sizeof(req), FRA_SRC,
 579                                   &dst.data, dst.bytelen);
 580                 } else if (strcmp(*argv, "to") == 0) {
 581                         inet_prefix dst;
 582
 583                         NEXT_ARG();
 584                         get_prefix(&dst, *argv, req.r.rtm_family);
 585                         req.r.rtm_dst_len = dst.bitlen;
 586                         addattr_l(&req.n, sizeof(req), FRA_DST,
 587                                   &dst.data, dst.bytelen);
 588                 } else if (matches(*argv, "preference") == 0 ||
 589                            matches(*argv, "order") == 0 ||
 590                            matches(*argv, "priority") == 0) {
 591                         __u32 pref;
 592
 593                         NEXT_ARG();
 594                         if (get_u32(&pref, *argv, 0))
 595                                 invarg("preference value is invalid\n", *argv);
 596                         addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
 597                 } else if (strcmp(*argv, "tos") == 0 ||
 598                            matches(*argv, "dsfield") == 0) {
 599                         __u32 tos;
 600
 601                         NEXT_ARG();
 602                         if (rtnl_dsfield_a2n(&tos, *argv))
 603                                 invarg("TOS value is invalid\n", *argv);
 604                         req.r.rtm_tos = tos;
 605                 } else if (strcmp(*argv, "fwmark") == 0) {
 606                         char *slash;
 607                         __u32 fwmark, fwmask;
 608
 609                         NEXT_ARG();
 610
 611                         slash = strchr(*argv, '/');
 612                         if (slash != NULL)
 613                                 *slash = '\0';
 614                         if (get_u32(&fwmark, *argv, 0))
 615                                 invarg("fwmark value is invalid\n", *argv);
 616                         addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
 617                         if (slash) {
 618                                 if (get_u32(&fwmask, slash+1, 0))
 619                                         invarg("fwmask value is invalid\n",
 620                                                slash+1);
 621                                 addattr32(&req.n, sizeof(req),
 622                                           FRA_FWMASK, fwmask);
 623                         }
 624                 } else if (matches(*argv, "realms") == 0) {
 625                         __u32 realm;
 626
 627                         NEXT_ARG();
 628                         if (get_rt_realms_or_raw(&realm, *argv))
 629                                 invarg("invalid realms\n", *argv);
 630                         addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
 631                 } else if (matches(*argv, "table") == 0 ||
 632                            strcmp(*argv, "lookup") == 0) {
 633                         NEXT_ARG();
 634                         if (rtnl_rttable_a2n(&tid, *argv))
 635                                 invarg("invalid table ID\n", *argv);
 636                         if (tid < 256)
 637                                 req.r.rtm_table = tid;
 638                         else {
 639                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 640                                 addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
 641                         }
 642                         table_ok = 1;
 643                 } else if (matches(*argv, "suppress_prefixlength") == 0 ||
 644                            strcmp(*argv, "sup_pl") == 0) {
 645                         int pl;
 646
 647                         NEXT_ARG();
 648                         if (get_s32(&pl, *argv, 0) || pl < 0)
 649                                 invarg("suppress_prefixlength value is invalid\n",
 650                                        *argv);
 651                         addattr32(&req.n, sizeof(req),
 652                                   FRA_SUPPRESS_PREFIXLEN, pl);
 653                 } else if (matches(*argv, "suppress_ifgroup") == 0 ||
 654                            strcmp(*argv, "sup_group") == 0) {
 655                         NEXT_ARG();
 656                         int group;
 657
 658                         if (rtnl_group_a2n(&group, *argv))
 659                                 invarg("Invalid \"suppress_ifgroup\" value\n",
 660                                        *argv);
 661                         addattr32(&req.n, sizeof(req),
 662                                   FRA_SUPPRESS_IFGROUP, group);
 663                 } else if (strcmp(*argv, "dev") == 0 ||
 664                            strcmp(*argv, "iif") == 0) {
 665                         NEXT_ARG();
 666                         addattr_l(&req.n, sizeof(req), FRA_IFNAME,
 667                                   *argv, strlen(*argv)+1);
 668                 } else if (strcmp(*argv, "oif") == 0) {
 669                         NEXT_ARG();
 670                         addattr_l(&req.n, sizeof(req), FRA_OIFNAME,
 671                                   *argv, strlen(*argv)+1);
 672                 } else if (strcmp(*argv, "l3mdev") == 0) {
 673                         addattr8(&req.n, sizeof(req), FRA_L3MDEV, 1);
 674                         table_ok = 1;
 675                         l3mdev_rule = 1;
 676                 } else if (strcmp(*argv, "nat") == 0 ||
 677                            matches(*argv, "map-to") == 0) {
 678                         NEXT_ARG();
 679                         fprintf(stderr, "Warning: route NAT is deprecated\n");
 680                         addattr32(&req.n, sizeof(req), RTA_GATEWAY,
 681                                   get_addr32(*argv));
 682                         req.r.rtm_type = RTN_NAT;
 683                 } else {
 684                         int type;
 685
 686                         if (strcmp(*argv, "type") == 0)
 687                                 NEXT_ARG();
 688
 689                         if (matches(*argv, "help") == 0)
 690                                 usage();
 691                         else if (matches(*argv, "goto") == 0) {
 692                                 __u32 target;
 693
 694                                 type = FR_ACT_GOTO;
 695                                 NEXT_ARG();
 696                                 if (get_u32(&target, *argv, 0))
 697                                         invarg("invalid target\n", *argv);
 698                                 addattr32(&req.n, sizeof(req),
 699                                           FRA_GOTO, target);
 700                         } else if (matches(*argv, "nop") == 0)
 701                                 type = FR_ACT_NOP;
 702                         else if (rtnl_rtntype_a2n(&type, *argv))
 703                                 invarg("Failed to parse rule type", *argv);
 704                         req.r.rtm_type = type;
 705                         table_ok = 1;
 706                 }
 707                 argc--;
 708                 argv++;
 709         }
 710
 711         if (l3mdev_rule && tid != 0) {
 712                 fprintf(stderr,
 713                         "table can not be specified for l3mdev rules\n");
 714                 return -EINVAL;
 715         }
 716
 717         if (req.r.rtm_family == AF_UNSPEC)
 718                 req.r.rtm_family = AF_INET;
 719
 720         if (!table_ok && cmd == RTM_NEWRULE)
 721                 req.r.rtm_table = RT_TABLE_MAIN;
 722
 723         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 724                 return -2;
 725
 726         return 0;
 727 }
 728
 729 int do_iprule(int argc, char **argv)
 730 {
 731         if (argc < 1) {
 732                 return iprule_list_flush_or_save(0, NULL, IPRULE_LIST);
 733         } else if (matches(argv[0], "list") == 0 ||
 734                    matches(argv[0], "lst") == 0 ||
 735                    matches(argv[0], "show") == 0) {
 736                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_LIST);
 737         } else if (matches(argv[0], "save") == 0) {
 738                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_SAVE);
 739         } else if (matches(argv[0], "restore") == 0) {
 740                 return iprule_restore();
 741         } else if (matches(argv[0], "add") == 0) {
 742                 return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
 743         } else if (matches(argv[0], "delete") == 0) {
 744                 return iprule_modify(RTM_DELRULE, argc-1, argv+1);
 745         } else if (matches(argv[0], "flush") == 0) {
 746                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_FLUSH);
 747         } else if (matches(argv[0], "help") == 0)
 748                 usage();
 749
 750         fprintf(stderr,
 751                 "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
 752         exit(-1);
 753 }
 754
 755 int do_multirule(int argc, char **argv)
 756 {
 757         switch (preferred_family) {
 758         case AF_UNSPEC:
 759         case AF_INET:
 760                 preferred_family = RTNL_FAMILY_IPMR;
 761                 break;
 762         case AF_INET6:
 763                 preferred_family = RTNL_FAMILY_IP6MR;
 764                 break;
 765         case RTNL_FAMILY_IPMR:
 766         case RTNL_FAMILY_IP6MR:
 767                 break;
 768         default:
 769                 fprintf(stderr,
 770                         "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
 771                         preferred_family);
 772                 exit(-1);
 773         }
 774
 775         return do_iprule(argc, argv);
 776 }